fix(deps): update dependency com.google.firebase:firebase-admin to v6.16.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.firebase:firebase-admin (source)	6.8.1 -> 6.16.0

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Release Notes

firebase/firebase-admin-java (com.google.firebase:firebase-admin)

v6.16.0: Firebase Admin Java SDK v6.16.0

New Features

• feat(auth): Support for creating tenant-scoped session cookies (#​467)

Bug Fixes

• fix(fcm): Added toString() in TopicManagementResponse for logging (#​469)

Miscellaneous

• [chore] Release 6.16.0 (#​471)
• Fix javadoc error caused by having protected parameters public methods (#​470)
• chore(auth): Added snippets for multitenancy and IdP management (#​461)

v6.15.0: Firebase Admin Java SDK v6.15.0

New Features

• feat(auth): Add tenant operations, tenant-aware user operations, and provider config operations (#​395)

Bug Fixes

• fix: Importing GCP dependencies via official BOMs (#​451)

Miscellaneous

• [chore] Release 6.15.0 (#​457)
• Fix documentation strings in Android Notification (#​445)

v6.14.0: Firebase Admin Java SDK v6.14.0

Miscellaneous

• [chore] Release 6.14.0 (#​444)
• Fixed a flaky auth integration test by retrying the GetUser() API call a few times with a small delay (#​442)
• Support direct_boot_ok parameter (#​329)
• Add FcmOptions on MulticastMessage (#​439)
• chore: Upgraded GCP and other util dependencies (#​438)
• chore: Updated integration tests to use non-public rules (#​417)

v6.13.0: Firebase Admin Java SDK v6.13.0

New Features

• feat(auth): Add bulk get/delete methods (#​365)

Miscellaneous

• [chore] Release 6.13.0 take 4 (#​416)
• [chore] Release 6.13.0 take 3 (#​415)
• [chore] Release 6.13.0 take 2 (#​414)
• [chore] Release 6.13.0 (#​413)
• chore: Setting the version of the Maven Javadoc plugin (#​412)
• Bump netty.version from 4.1.34.Final to 4.1.45.Final (#​373)
• Testable BatchResponse (#​389)
• chore: Updated CI workflow to run on all PRs (#​390)
• chore: Implementing GitHub Actions release workflow (#​363)
• Staged Release 6.12.2 (#​364)

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